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Internet Low Bitrate Codec (iLBC) is a royalty-free narrowband speech audio coding format and an open-source reference implementation (), developed by Global IP Solutions (GIPS) formerly Global IP Sound (acquired by Google Inc in 2011 [2]).
BroadVoice Speech Codec Open Source C Code; ANSI/SCTE 24-22 2013 (iLBCv2.0) ANSI/SCTE 24-23 2007 (BroadVoice32) BroadVoice Speech Codec Open Source C Code; IETF RFCs: Internet Low Bit Rate Codec (iLBC, RFC 3951) – developed by Global IP Solutions/Google WebRTC; IETF Internet Draft. SILK (used by Skype) [22] CELT (developed by Xiph.Org ...
The Lyra codec is designed to transmit speech in real-time when bandwidth is severely restricted, such as over slow or unreliable network connections. [1] It runs at fixed bitrates of 3.2, 6, and 9 kbit/s and it is intended to provide better quality than codecs that use traditional waveform-based algorithms at similar bitrates.
MP3 LAME 3.99.5 VBR, -V 5 (~130 kbps, a well-known comparison but at higher bitrate) AAC FAAC v1.28 (Mid-low Anchor)-b 96; AAC FAAC v1.28 (Low Anchor)-q 30 (~52 kbps) Various 40 33 Opus: In results Opus is clear winner, Apple AAC is second, Ogg Vorbis and higher-bitrate LAME MP3 are statistically tied in joint third place. FAAC, known to be ...
Turing – A High Efficiency Video Coding (HEVC/H.265) encoder implemented by BBC Research. libaom – Reference implementation for the royalty free AV1 video coding format by AOMedia, inheriting technologies from VP9, Daala and Thor. Kvazaar – An academic open-source encoder based on the High Efficiency Video Coding (HEVC/H.265) standard.
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Codec 2 is a low-bitrate speech audio codec (speech coding) that is patent free and open source. [1] Codec 2 compresses speech using sinusoidal coding, a method specialized for human speech. Bit rates of 3200 to 450 bit/s have been successfully created. Codec 2 was designed to be used for amateur radio and other high compression voice applications.
G.723.1 is a hybrid speech coder, with high bit rate using multi-pulse maximum likelihood quantization (MP-MLQ) and low bit rate using algebraic code-excited linear prediction (ACELP) The complexity of the algorithm is rated at 25, using a relative scale where G.711 is 1 and G.729a is 15.